On Friday 29 October 2004 22:13, Stas Bekman wrote: > Torsten Förtsch wrote: > > On Friday 29 October 2004 20:17, Stas Bekman wrote: > >>>perl allows to modify $0. Then top, ps & co would display the new > >>> process title. Can the process title of a mod_perl modified apache be > >>> set this way? > >> ... > >>Take a look at this commit, which might be of some relevance: > >>http://marc.theaimsgroup.com/?l=apache-modperl-cvs&m=107672268012042&w=2 > > > > But I see, it is not supported. > > Due to internal Apache corruptions, no.
I have just uploaded Sys::Proctitle that modifies the process title at C
level. It works only on linux. I have tried it with 2.0.52+mp2-RC1.
To the internal Apache corruptions: my first attempt was simply to make a copy
of __environ via malloc() and strdup(). With pure perl that worked but with
apache/mod_perl it gave segfaults or double free messages from glibc
depending on the require'ing or use'ing of the module. Some poking on
putenv/getenv/setenv source code revealed big magic and led me to the
following approach of copying the environment:
clearenv();
for( i=0; envp[i]; i++ ) {
char *cp=strchr( envp[i], '=' );
if( cp ) {
*cp++='\0';
setenv( envp[i], cp, 1 );
}
}
clearenv() simply sets __environ=NULL. setenv() then builds a new environment.
I don't know anything about how mp2 and apache interact regarding the
environment. But maybe it helps to let $0 be assigned to in mod_perl.
Again, the module is very linux specific.
As an example of using Sys::Proctitle I have uploaded Apache::ShowStatus. It
provides a PerlInitHandler that places a Sys::Proctitle object in $r->pnotes
changing the command line to "httpd: ".$r->the_request. When the request is
deleted the object is destroyed and the command line is changed back.
Obviously this makes sense only with prefork mpm.
Torsten
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